WO2017082395A1 - Procédé de déshydratation de dispersion de pâte modifiée chimiquement - Google Patents

Procédé de déshydratation de dispersion de pâte modifiée chimiquement Download PDF

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Publication number
WO2017082395A1
WO2017082395A1 PCT/JP2016/083550 JP2016083550W WO2017082395A1 WO 2017082395 A1 WO2017082395 A1 WO 2017082395A1 JP 2016083550 W JP2016083550 W JP 2016083550W WO 2017082395 A1 WO2017082395 A1 WO 2017082395A1
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Prior art keywords
pulp
chemically modified
modified pulp
mass
dispersion
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PCT/JP2016/083550
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English (en)
Japanese (ja)
Inventor
利一 村松
勝則 世見
伸治 佐藤
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日本製紙株式会社
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Application filed by 日本製紙株式会社 filed Critical 日本製紙株式会社
Priority to EP16864356.7A priority Critical patent/EP3375933A4/fr
Priority to US15/770,528 priority patent/US20190055694A1/en
Priority to CN201680063214.0A priority patent/CN108350654A/zh
Priority to JP2017550413A priority patent/JP7084721B2/ja
Publication of WO2017082395A1 publication Critical patent/WO2017082395A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
    • C08B11/10—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals
    • C08B11/12—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals substituted with carboxylic radicals, e.g. carboxymethylcellulose [CMC]
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/20—Chemically or biochemically modified fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/20—Chemically or biochemically modified fibres
    • D21H11/22—Chemically or biochemically modified fibres cationised

Definitions

  • the present invention relates to a method for dehydrating a chemically modified pulp dispersion.
  • nanofibers nanofibers
  • nanofibers have attracted a great deal of attention because, when the fibers are made as thin as possible, completely new physical properties that were not found in conventional fibers are born.
  • this nanofiber for example, it is expected to develop a purification device with a high-performance filter that does not allow any fine foreign substances to pass through, increase the strength of chemical fibers and high-performance clothing, and increase the efficiency of fuel cells. ing.
  • Cellulose nanofiber is a fiber having a nano-level fiber diameter of 1000 nm or less, and is generally obtained by defibrating chemically modified cellulose fiber (hereinafter also referred to as “chemically modified pulp”) with mechanical shearing force. Can be obtained (Patent Document 1). Moreover, regarding the manufacturing method of a cellulose nanofiber, various manufacturing methods including the manufacturing method described in patent document 1 are examined.
  • this invention aims at providing the spin-drying
  • the present invention provides (1) to (6).
  • Liquid dehydration method (4) The chemically modified pulp dispersion according to (1), wherein the chemically modified pulp has a degree of cation substitution per glucose unit of cellulose constituting the chemically modified pulp of 0.02 to 0.50. Dehydration method. (5) A method for producing a chemically modified pulp dehydrated product having a solid content of 5 to 30% by mass, wherein the dehydrating method according to any one of (1) to (4) is used. (6) A method for producing cellulose nanofiber, characterized in that a chemically modified pulp dehydrated product dehydrated by the dehydration method according to any one of (1) to (4) is used as a raw material.
  • the present invention relates to a dehydration method characterized by dehydrating a chemically modified pulp with a screw press capable of continuous operation, and the concentration of the chemically modified pulp can be increased.
  • a dehydrated product dehydrated cake in which the content of the chemically modified pulp in the chemically modified pulp dispersion is 5 to 30% by mass, preferably 5 to 25% by mass, more preferably 5 to 20% by mass is good.
  • the chemically modified pulp remains in the chemically modified pulp by dehydration treatment (pressing treatment) so that the amount of the chemically modified cellulose in the dispersion is 5% by mass or more, preferably 7% by mass or more by a screw press.
  • Catalysts and inorganic salts can be greatly reduced.
  • pulp raw material examples include plant materials (for example, wood, bamboo, hemp, jute, kenaf, farmland waste, cloth, pulp (conifer unbleached kraft pulp (NUKP), conifer bleach).
  • plant materials for example, wood, bamboo, hemp, jute, kenaf, farmland waste, cloth, pulp (conifer unbleached kraft pulp (NUKP), conifer bleach).
  • NUKP conifer unbleached kraft pulp
  • NNKP Kraft pulp
  • LLKP hardwood unbleached kraft pulp
  • LLKP hardwood bleached kraft pulp
  • NUSP softwood unbleached sulfite pulp
  • TMP thermomechanical pulp
  • regenerated pulp Waste paper, etc.
  • animal materials for example, ascidians
  • algae for example, acetic acid bacteria (Acetobacter)
  • microbial products etc., any of which can be used.
  • Scan is a fiber.
  • bleached kraft pulp having a whiteness of 80% or more, bleached sulfite pulp having a whiteness of 80% or more, powdered cellulose, or microcrystalline cellulose powder is preferably used from the viewpoint of mass production and cost.
  • powdered cellulose and microcrystalline cellulose powder because a cellulose nanofiber dispersion having a lower viscosity can be produced even at a high concentration.
  • Powdered cellulose is rod-like particles made of microcrystalline cellulose obtained by removing the non-crystalline part of wood pulp by acid hydrolysis and then pulverizing and sieving.
  • the degree of polymerization of cellulose in powdered cellulose is about 100 to 500
  • the degree of crystallinity of powdered cellulose by X-ray diffraction is 70 to 90%
  • the volume average particle size by a laser diffraction type particle size distribution analyzer is preferably 100 ⁇ m. Or less, more preferably 50 ⁇ m or less.
  • the volume average particle diameter is 100 ⁇ m or less, a cellulose nanofiber dispersion excellent in fluidity can be obtained.
  • the powdered cellulose used in the present invention for example, a fixed particle size in the form of a rod shaft produced by a method of purifying and drying an undegraded residue obtained after acid hydrolysis of a selected pulp, pulverizing and sieving.
  • Crystalline cellulose powder having a distribution may be used, KC Flock (registered trademark) (manufactured by Nippon Paper Chemical Co., Ltd.), Theolas (registered trademark) (manufactured by Asahi Kasei Chemicals), Avicel (registered trademark) (manufactured by FMC) Commercial products such as may be used.
  • the carboxymethylated pulp when a carboxymethylated pulp is used as the chemically modified pulp, the carboxymethylated pulp may be obtained by carboxymethylating the above pulp raw material by a known method, using a commercially available product. Also good. In any case, it is preferable that the degree of carboxymethyl group substitution per anhydroglucose unit of the pulp is 0.01 to 0.50. The following method can be mentioned as an example of the method of manufacturing such a carboxymethylated pulp.
  • Pulp is used as a starting material, and 3 to 20 times by weight water and / or lower alcohol as a solvent, specifically water, methanol, ethanol, N-propyl alcohol, isopropyl alcohol, N-butanol, isobutanol, tertiary A single solvent such as butanol or a mixed medium of two or more is used.
  • the mixing ratio of the lower alcohol when mixing the lower alcohol is 60 to 95% by mass.
  • mercerizing agent 0.5 to 20 times moles of alkali metal hydroxide, specifically sodium hydroxide or potassium hydroxide is used per anhydroglucose residue of the bottoming material.
  • a bottoming raw material, a solvent, and a mercerizing agent are mixed, and a mercerization process is performed at a reaction temperature of 0 to 70 ° C., preferably 10 to 60 ° C., and a reaction time of 15 minutes to 8 hours, preferably 30 minutes to 7 hours.
  • a carboxymethylating agent is added in an amount of 0.05 to 10.0 times mol per glucose residue, a reaction temperature of 30 to 90 ° C., preferably 40 to 80 ° C., and a reaction time of 30 minutes to 10 hours, preferably 1 hour.
  • the etherification reaction is performed for ⁇ 4 hours.
  • the carboxylated pulp (also referred to as oxidized pulp) can be obtained by carboxylating (oxidizing) the above pulp raw material by a known method. it can.
  • the amount of carboxyl groups should be adjusted to 0.6 to 3.0 mmol / g with respect to the absolute dry mass of anion-modified cellulose nanofibers. It is preferable to adjust to 0.6 to 2.0 mmol / g, and it is more preferable to adjust to 1.0 to 2.0 mmol / g.
  • a pulp raw material is oxidized in water using an oxidizing agent in the presence of an N-oxyl compound and a compound selected from the group consisting of bromide, iodide, or a mixture thereof.
  • a method can be mentioned.
  • the primary hydroxyl group at the C6 position of the glucopyranose ring on the pulp surface is selectively oxidized, and the pulp fiber has an aldehyde group and a carboxyl group (—COOH) or carboxylate group (—COO—) on the surface.
  • concentration of the pulp at the time of reaction is not specifically limited, 5 mass% or less is preferable.
  • N-oxyl compound refers to a compound capable of generating a nitroxy radical.
  • any compound can be used as long as it promotes the target oxidation reaction.
  • TEMPO 2,2,6,6-tetramethylpiperidine-1-oxy radical
  • its derivatives for example, 4-hydroxy TEMPO
  • the amount of the N-oxyl compound used is not particularly limited as long as it is a catalytic amount capable of oxidizing the pulp as a raw material.
  • 0.01 to 10 mmol is preferable, 0.01 to 1 mmol is more preferable, and 0.05 to 0.5 mmol is more preferable with respect to 1 g of absolutely dry pulp. Further, it is preferably about 0.1 to 4 mmol / L with respect to the reaction system.
  • Bromide is a compound containing bromine, and examples thereof include alkali metal bromide that can be dissociated and ionized in water.
  • an iodide is a compound containing iodine, and examples thereof include alkali metal iodide.
  • the amount of bromide or iodide used can be selected as long as the oxidation reaction can be promoted.
  • the total amount of bromide and iodide is, for example, preferably 0.1 to 100 mmol, more preferably 0.1 to 10 mmol, and further preferably 0.5 to 5 mmol with respect to 1 g of absolutely dry pulp.
  • oxidizing agent known ones can be used, and for example, halogen, hypohalous acid, halous acid, perhalogen acid or salts thereof, halogen oxide, peroxide and the like can be used.
  • sodium hypochlorite is preferable because it is inexpensive and has a low environmental impact.
  • the appropriate amount of the oxidizing agent used is, for example, preferably 0.5 to 500 mmol, more preferably 0.5 to 50 mmol, still more preferably 1 to 25 mmol, and most preferably 3 to 10 mmol with respect to 1 g of absolutely dry pulp. . Further, for example, 1 to 40 mol is preferable with respect to 1 mol of the N-oxyl compound.
  • the reaction temperature is preferably 4 to 40 ° C., and may be room temperature of about 15 to 30 ° C.
  • carboxyl groups are generated in the pulp, so that the pH of the reaction solution is reduced.
  • an alkaline solution such as an aqueous sodium hydroxide solution is added to maintain the pH of the reaction solution at about 8 to 12, preferably about 10 to 11.
  • the reaction medium is preferably water because it is easy to handle and hardly causes side reactions.
  • the reaction time in the oxidation reaction can be appropriately set according to the progress of oxidation, and is usually 0.5 to 6 hours, for example, about 0.5 to 4 hours.
  • the oxidation reaction may be carried out in two stages. For example, by oxidizing oxidized pulp obtained by filtration after the completion of the first-stage reaction again under the same or different reaction conditions, the efficiency is not affected by the reaction inhibition by the salt generated as a by-product in the first-stage reaction. Can be oxidized well.
  • a method of oxidizing by contacting a gas containing ozone and a pulp raw material can be mentioned.
  • the ozone concentration in the gas containing ozone is preferably 50 to 250 g / m 3 , and more preferably 50 to 220 g / m 3 .
  • the amount of ozone added to the pulp raw material is preferably 0.1 to 30 parts by mass and more preferably 5 to 30 parts by mass when the solid content of the pulp raw material is 100 parts by mass.
  • the ozone treatment temperature is preferably 0 to 50 ° C., more preferably 20 to 50 ° C.
  • the ozone treatment time is not particularly limited, but is about 1 to 360 minutes, and preferably about 30 to 360 minutes. When the conditions for the ozone treatment are within these ranges, the pulp can be prevented from being excessively oxidized and decomposed, and the yield of oxidized pulp is improved.
  • an additional oxidation treatment may be performed using an oxidizing agent.
  • the oxidizing agent used for the additional oxidation treatment is not particularly limited, and examples thereof include chlorine compounds such as chlorine dioxide and sodium chlorite, oxygen, hydrogen peroxide, persulfuric acid, and peracetic acid.
  • these oxidizing agents can be dissolved in a polar organic solvent such as water or alcohol to prepare an oxidizing agent solution, and a pulp raw material can be immersed in the solution for additional oxidation treatment.
  • the amount of carboxyl groups in the oxidized pulp can be adjusted by controlling the reaction conditions such as the amount of oxidant added and the reaction time.
  • a cationizing agent such as glycidyltrimethylammonium chloride, 3-chloro-2hydroxypropyltrialkylammonium hydride, or a halohydrin type thereof is used as the cellulose raw material.
  • a cation-modified pulp can be obtained by reacting alkali metal hydroxide (sodium hydroxide, potassium hydroxide, etc.) in the presence of water and / or an alcohol having 1 to 4 carbon atoms.
  • the degree of cation substitution per glucose unit of the cation-modified pulp obtained is controlled by the amount of cationizing agent to be reacted, the composition ratio of water and / or alcohol having 1 to 4 carbon atoms. Can be adjusted.
  • the degree of cation substitution per glucose unit of the cation-modified pulp is preferably 0.02 to 0.50.
  • the pulps are electrically repelled. For this reason, the pulp which introduce
  • the cation substitution degree per glucose unit is smaller than 0.02, nano-fibrosis cannot be sufficiently performed.
  • the degree of cation substitution per glucose unit is more than 0.50, it may swell or dissolve, and may not be obtained as a nanofiber.
  • the ratio of the compound having a phosphoric acid group to the pulp raw material is preferably 0.1 to 500 parts by mass in terms of the addition amount converted to phosphorus element with respect to 100 parts by mass of the solid content of the pulp raw material. More preferably, the amount is 2 to 200 parts by mass.
  • the screw press is composed of a screw cylinder rotated by driving means, screw blades provided spirally on the outer periphery of the screw cylinder, and a substantially cylindrical filter tube surrounding the screw blades. Moisture containing the inlet portion and the outlet portion at both ends of the cylinder, and reducing the space surrounded by the screw barrel, the screw blades, and the filter cylinder from the inlet portion toward the outlet portion, and introduced from the inlet portion It is an apparatus for compressing and dewatering the raw material and discharging it as a dehydrated cake from the outlet.
  • the water-containing raw material charged from the inlet is conveyed in the direction of the outlet by the rotation of the screw cylinder in the filter cylinder, the water is squeezed to reduce the volume, and moisture leaks from the dewatering hole of the filter cylinder.
  • the dehydrated raw material is discharged from the outlet as a dehydrated cake.
  • the rotational speed of the screw is not particularly limited, but is generally adjusted in the range of 3 to 100 rpm.
  • the screw compression ratio volume ratio between the inlet side and the outlet side of the raw material with respect to the screw
  • the screw compression ratio is not particularly limited, but is generally adjusted in the range of 1/10 to 1/1.
  • the hole diameter of the strainer is increased, the squeezing power increases, and the moisture content of the dewatered cake discharged from the discharge port decreases.
  • the hole diameter of the strainer can be arbitrarily set on the inlet side, the center, the outlet side, etc. of the raw material, and is generally adjusted within the range of the hole diameter 0 (blind plate) to 120 mm.
  • the outlet straight ratio (a value indicating the distance of the concentrated portion at the outlet of the raw material) is increased, the squeezing power increases and the moisture content of the dehydrated cake discharged from the discharge port decreases.
  • the outlet straight ratio is not particularly limited, but is generally adjusted in the range of 1 to 10.
  • any type of screw press such as a horizontal screw press or a vertical screw press can be used.
  • the chemically modified pulp is preferably pressed with a screw press so that the solid content of the dehydrated cake is 5 to 30% by mass.
  • the solid content of the dehydrated product (dehydrated cake) after the dehydration treatment (pressing treatment) is less than 5% by mass, the chemically modified pulp cannot be sufficiently concentrated, and the catalyst and inorganic salts in the chemically modified pulp are excluded. Is difficult.
  • the solid content concentration exceeds 30% by mass, the pulp fiber of the chemically modified pulp is damaged and good redispersibility cannot be obtained.
  • the time for pressing the chemically modified pulp with a screw press that is, the time for the chemically modified pulp to stay in the screw press is not particularly limited, but is usually about 1 to 120 minutes.
  • the dehydrated product of chemically modified pulp obtained in the present invention can be used as a raw material for cellulose nanofibers.
  • a raw material for cellulose nanofibers it is preferable to adjust the dehydrated product (dehydrated cake) of the obtained chemically modified pulp to an appropriate concentration, and the adjusted dehydrated product (dispersion) is defibrated.
  • the types of equipment used for the defibrating treatment include high-speed rotating, colloid mill, high-pressure, roll mill, and ultrasonic equipment. Cellulose nanofiber dispersions that excel in transparency and fluidity can be used efficiently.
  • a wet high pressure or ultra high pressure homogenizer that can be dispersed under conditions of 50 MPa or more, preferably 100 MPa or more, more preferably 140 MPa or more.
  • Example 1 Manufacture of carboxylated (TEMPO oxidized) pulp> 50 g of bleached unbeaten kraft pulp derived from conifers (Nippon Paper Industries Co., Ltd.) is added to 5000 mL of an aqueous solution in which 780 mg (5 mmol) of TEMPO (Sigma Aldrich) and 7540 mg (50 mmol) of sodium bromide are dissolved, and the pulp is uniformly distributed. Stir until dispersed. After adding 180 mL of a sodium hypochlorite aqueous solution (effective chlorine 5%) to the reaction system, the pH was adjusted to 10.3 with a 0.5N aqueous hydrochloric acid solution to start the oxidation reaction.
  • TEMPO bleached unbeaten kraft pulp derived from conifers
  • the pH in the system was lowered, but a 0.5N aqueous sodium hydroxide solution was successively added to adjust the pH to 10.
  • the mixture was filtered with a centrifugal dehydrator and sufficiently washed with water to obtain oxidized pulp.
  • the carboxyl group content of the oxidized pulp was 1.8 mmol / g.
  • a 1% slurry of oxidized pulp was processed with a screw press to a solid content of 14% by mass.
  • the solid content concentration of the dehydrated cake was calculated from the change in mass before and after 5 g of the dehydrated cake was allowed to stand in a dryer at 105 ° C. for 24 hours.
  • Example 2 The same treatment as in Example 1 was conducted except that the conditions of the screw press were adjusted so that the solid content was 10% by mass.
  • Example 3 The same treatment as in Example 1 was conducted except that the conditions of the screw press were adjusted so that the solid content was 18% by mass.
  • Example 4 The same treatment as in Example 1 was conducted except that the conditions of the screw press were adjusted so that the solid content was 30% by mass.
  • CM carboxymethylated pulp
  • a reactor capable of stirring the pulp 112 g of a 50 mass% aqueous sodium hydroxide solution and 67 g of water were added while stirring 250 g of pulp (LBKP, manufactured by Nippon Paper Industries Co., Ltd.) with a dry mass.
  • LKP manufactured by Nippon Paper Industries Co., Ltd.
  • 364 g of a 35 mass% sodium monochloroacetate aqueous solution was added with stirring. Then, it stirred at 30 degreeC for 30 minutes, heated up to 70 degreeC over 30 minutes, and reacted at 70 degreeC for 1 hour.
  • carboxymethylated cellulose (carboxymethylated pulp) having a carboxymethyl substitution degree of 0.25 per glucose unit.
  • a 1% slurry of carboxymethylated pulp was treated with a screw press to a solid content of 14% by mass.
  • the degree of substitution of the carboxymethyl group was determined by preparing a sample in a 0.6% by mass slurry, adding 0.1 M aqueous hydrochloric acid solution to pH 2.4, and then dropping 0.05 N aqueous sodium hydroxide solution dropwise to adjust the pH to 11 Then, the electric conductivity was measured until the amount of carboxylic acid group was determined, and the amount of carboxyl groups was measured from the amount of sodium hydroxide consumed in the neutralization step of the weak acid where the change in electric conductivity was gradual, and was calculated using the following equation.
  • the degree of substitution referred to here represents the average value of the number of moles of substituents per mole of anhydroglucose unit. C below refers to the amount (mol) of carboxymethyl groups per gram of pulp.
  • Carboxymethyl substitution degree (162 ⁇ C) / (1-58 ⁇ C)
  • Example 6 The same treatment as in Example 5 was performed except that the conditions of the screw press were adjusted so that the solid content was 5% by mass.
  • Example 7 The same treatment as in Example 5 was performed except that the conditions of the screw press were adjusted so that the solid content was 10% by mass.
  • Example 8 The same treatment as in Example 5 was conducted except that the conditions of the screw press were adjusted so that the solid content was 18% by mass.
  • Example 9 The treatment was performed in the same manner as in Example 5 except that the conditions of the screw press were adjusted so that the solid content was 22% by mass.
  • Comparative Example 1 Although it processed similarly to Example 5 except having processed with the centrifuge, solid content was not able to be 3 mass% or more.

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  • Engineering & Computer Science (AREA)
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Abstract

L'invention concerne un procédé de déshydratation d'une dispersion d'une pâte modifiée chimiquement (pâte oxydée, pâte carboxyméthylée ou pâte cationisée) obtenue par modification chimique d'une charge de pâte, caractérisé par la déshydratation de la dispersion d'une pâte modifiée chimiquement au moyen d'une presse à vis.
PCT/JP2016/083550 2015-11-13 2016-11-11 Procédé de déshydratation de dispersion de pâte modifiée chimiquement WO2017082395A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP16864356.7A EP3375933A4 (fr) 2015-11-13 2016-11-11 Procédé de déshydratation de dispersion de pâte modifiée chimiquement
US15/770,528 US20190055694A1 (en) 2015-11-13 2016-11-11 Method for dehydrating dispersion of chemically modified pulp
CN201680063214.0A CN108350654A (zh) 2015-11-13 2016-11-11 化学改性纸浆分散液的脱水方法
JP2017550413A JP7084721B2 (ja) 2015-11-13 2016-11-11 化学変性パルプ分散液の脱水方法

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JP2015-223110 2015-11-13
JP2015223110 2015-11-13

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WO2017082395A1 true WO2017082395A1 (fr) 2017-05-18

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US (1) US20190055694A1 (fr)
EP (1) EP3375933A4 (fr)
JP (2) JP7084721B2 (fr)
CN (1) CN108350654A (fr)
WO (1) WO2017082395A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019172849A (ja) * 2018-03-29 2019-10-10 日本製紙株式会社 変性パルプの製造方法

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Publication number Priority date Publication date Assignee Title
WO2022246143A1 (fr) * 2021-05-21 2022-11-24 The Regents Of The University Of Michigan Pâte de bois à fonction ionique et procédés associés pour le traitement de l'eau
WO2023037161A1 (fr) * 2021-09-08 2023-03-16 Fiberlean Technologies Limited Système de dispersion mobile et procédés de resuspension de cellulose microfibrillée partiellement séchée

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